As you were coming warning, Apple just stop signing iOS 10.1.1, so from now no longer possible downgrade from iOS 10.2.
In this way, all who have upgraded to iOS 10.2 lose the chance to enjoy the jailbreak, as you know, will be published shortly by a few days ago was released one fully compatible with iOS exploit 10.1.1 .
It is no longer possible to install a version other than iOS 10.2
Otherwise, I remind you that if you find a version comprised between 10 and iOS iOS 10.1.1 update you must not under any circumstances, because if you do you will lose the chance to enjoy the jailbreak.
In short, if you have updated to iOS 10.2 do not waste your time trying to install an older version, as it will fail and all you will get is to have to restore your device.